Oliver Burkeman writes in The Guardian:

[Research] points to an alternative approach [to happiness]: a ‘negative path’ to happiness that entails taking a radically different stance towards those things most of us spend our lives trying hard to avoid. This involves learning to enjoy uncertainty, embracing insecurity and becoming familiar with failure. In order to be truly happy, it turns out, we might actually need to be willing to experience more negative emotions – or, at the very least, to stop running quite so hard from them.